/* ==========================================================================
   Demand Field Notes — styles.css
   Implemented from DESIGN.md (source of truth). Single file, no framework.
   Breakpoints: base ≥1025px (1440 check) · ≤1024px (768 check) · ≤480px (390 check)
   ========================================================================== */

/* --- Tokens ------------------------------------------------------------- */
:root {
  /* Color */
  --color-bg: #FAF8F3;
  --color-surface: #FFFFFF;
  --color-ink: #1C1A15;
  --color-ink-secondary: #56524A;
  --color-muted: #7A756A;
  --color-border: #E3DFD5;
  --color-accent: #B4530A;
  --color-accent-strong: #964508;
  --color-accent-soft: #F4E7DA;

  /* Type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;

  /* Spacing — 8px system */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 80px;
  --space-9: 96px;
  --space-10: 128px;

  /* Layout */
  --container: 1104px;

  /* Radii */
  --radius-s: 6px;
  --radius-m: 8px;
}

/* --- Reset -------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--color-ink);
  background-color: var(--color-bg);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-accent-strong);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* --- Layout primitives --------------------------------------------------- */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section {
  padding-block: var(--space-9);
}

.section + .section {
  padding-top: 0;
}

.section-head {
  max-width: 640px;
  margin-bottom: var(--space-6);
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
}

p {
  color: var(--color-ink-secondary);
}

.lead {
  font-size: 1.1875rem;
  line-height: 1.6;
}

/* Mono labels, eyebrows, tags */
.mono-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink-secondary);
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
  background: var(--color-accent-soft);
  padding: 2px var(--space-1);
  border-radius: var(--radius-s);
}

/* --- Header -------------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 64px;
}

.wordmark {
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--color-ink);
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.site-nav a.nav-link {
  color: var(--color-ink-secondary);
  text-decoration: none;
  font-size: 1rem;
}

.site-nav a.nav-link:hover {
  color: var(--color-ink);
}

/* --- Buttons ------------------------------------------------------------- */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.2;
  padding: 12px var(--space-3);
  border-radius: var(--radius-s);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-accent);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--color-accent-strong);
  color: #FFFFFF;
}

.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-ink);
}

.btn-secondary:hover {
  background: rgba(28, 26, 21, 0.06);
  color: var(--color-ink);
}

/* --- Hero ----------------------------------------------------------------- */
.hero {
  padding-block: var(--space-10) var(--space-9);
}

.hero .lead {
  max-width: 640px;
  margin-top: var(--space-3);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.hero-fineprint {
  margin-top: var(--space-3);
}

/* --- Comparison table ------------------------------------------------------ */
.table-wrap {
  overflow-x: auto;
}

.compare {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
}

.compare th,
.compare td {
  text-align: left;
  vertical-align: top;
  padding: var(--space-3) var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.compare thead th {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink-secondary);
  background: var(--color-surface);
}

.compare tbody th {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink-secondary);
  white-space: nowrap;
}

/* "This is us" column */
.compare .us {
  background: var(--color-accent-soft);
}

.compare thead th.us {
  color: var(--color-accent-strong);
}

.table-note {
  margin-top: var(--space-3);
}

/* --- Article cards ----------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: var(--space-5);
}

.card h3 {
  margin-top: var(--space-2);
}

.card p {
  margin-top: var(--space-1);
}

.card-footer {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

a.card {
  text-decoration: none;
  color: inherit;
  display: block;
}

a.card:hover {
  border-color: var(--color-accent);
}

a.card:hover h3 {
  color: var(--color-accent-strong);
}

.grid-foot {
  margin-top: var(--space-4);
}

/* --- Audit page: intro + form ------------------------------------------------- */
.page-head {
  padding-block: var(--space-8) var(--space-6);
}

.page-head .lead {
  max-width: 640px;
  margin-top: var(--space-3);
}

.includes {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  max-width: 640px;
}

.includes li {
  padding-left: var(--space-3);
  position: relative;
  color: var(--color-ink-secondary);
  margin-top: var(--space-1);
}

.includes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 8px;
  border: 1px solid var(--color-accent);
  background: var(--color-accent-soft);
}

.form-section {
  padding-block: 0 var(--space-9);
}

.audit-form {
  max-width: 560px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: var(--space-5);
}

.field {
  margin-top: var(--space-3);
}

.field:first-child {
  margin-top: 0;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: var(--space-1);
}

.field label .optional {
  font-weight: 400;
  color: var(--color-ink-secondary);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-s);
  padding: 10px 12px;
}

.field textarea {
  resize: vertical;
  min-height: 96px;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-color: var(--color-accent);
}

.field .helper {
  font-size: 0.875rem;
  color: var(--color-ink-secondary);
  margin-top: var(--space-1);
}

.audit-form .btn {
  width: 100%;
  margin-top: var(--space-4);
  border: none;
}

.form-status {
  margin-top: var(--space-3);
  font-size: 0.9375rem;
  display: none;
}

.form-status.is-visible {
  display: block;
}

.form-status.is-error {
  color: var(--color-accent-strong);
}

.form-status.is-success {
  color: var(--color-ink);
}

/* Pricing fine print — the only place price appears */
.pricing-line {
  margin-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-secondary);
  max-width: 640px;
}

/* --- Footer ---------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-7) var(--space-5);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
  max-width: 720px;
}

.footer-cols h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.footer-cols p {
  font-size: 0.9375rem;
}

.footer-nav {
  margin-top: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: 0.9375rem;
}

.footer-nav a {
  color: var(--color-accent);
  text-decoration: none;
}

.footer-nav a:hover {
  text-decoration: underline;
}

.footer-bottom {
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

/* --- Breakpoint: ≤1024px (covers 768) --------------------------------------- */
@media (max-width: 1024px) {
  .section,
  .hero {
    padding-block: var(--space-8);
  }

  .section + .section {
    padding-top: 0;
  }

  .page-head {
    padding-block: var(--space-7) var(--space-5);
  }
}

/* --- Breakpoint: ≤480px (covers 390) ----------------------------------------- */
@media (max-width: 480px) {
  .container {
    padding-inline: var(--space-2);
  }

  body {
    font-size: 1rem;
  }

  .section,
  .hero {
    padding-block: var(--space-7);
  }

  .site-header .container {
    flex-wrap: wrap;
    padding-block: var(--space-1);
    row-gap: 0;
  }

  .site-nav {
    gap: var(--space-2);
  }

  .hero-cta .btn,
  .audit-form .btn {
    width: 100%;
    text-align: center;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  /* Comparison table collapses to stacked blocks, labels via data-label */
  .compare thead {
    display: none;
  }

  .compare,
  .compare tbody,
  .compare tr,
  .compare tbody th,
  .compare td {
    display: block;
    width: 100%;
  }

  .compare tr {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-m);
    background: var(--color-surface);
    margin-top: var(--space-2);
    overflow: hidden;
  }

  .compare td,
  .compare tbody th {
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-3);
    white-space: normal;
  }

  .compare td:last-child {
    border-bottom: none;
  }

  .compare tbody th {
    background: var(--color-bg);
    color: var(--color-ink);
  }

  .compare td.us::before,
  .compare td:not(.us)::before {
    content: attr(data-label);
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 2px;
  }

  .compare td.us {
    background: var(--color-accent-soft);
  }

  .footer-cols {
    grid-template-columns: 1fr;
  }
}

/* --- RTL (ar) — minimal overrides; the rest mirrors via CSS logical flow --- */
[dir="rtl"] .compare th,
[dir="rtl"] .compare td {
  text-align: right;
}

[dir="rtl"] .includes li {
  padding-left: 0;
  padding-right: var(--space-3);
}

[dir="rtl"] .includes li::before {
  left: auto;
  right: 0;
}

/* ==========================================================================
   Article pages (/content/) — appended; no existing rules modified.
   Tokens and breakpoints per DESIGN.md; 68ch measure for long-form reading.
   ========================================================================== */

.article-head {
  padding-block: var(--space-8) var(--space-6);
}

.article-head .mono-label {
  margin-bottom: var(--space-2);
}

.article-head h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  max-width: 720px;
}

.article-body {
  max-width: 68ch;
  padding-bottom: var(--space-9);
}

.article-body h2 {
  font-size: clamp(1.375rem, 2.5vw, 1.75rem);
  line-height: 1.25;
  margin-top: var(--space-7);
}

.article-body p,
.article-body ul,
.article-body ol,
.article-body .table-wrap {
  margin-top: var(--space-2);
}

.article-body li {
  margin-top: var(--space-1);
  color: var(--color-ink-secondary);
}

.article-body li::marker {
  color: var(--color-accent);
}

/* Article tables reuse .compare (mobile stacking included); row labels wrap
   inside the 68ch measure instead of forcing nowrap width */
.article-body .compare {
  font-size: 0.9375rem;
}

.article-body .compare tbody th {
  white-space: normal;
}

.article-body blockquote {
  margin-top: var(--space-3);
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-accent);
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9375em;
  background: var(--color-accent-soft);
  padding: 1px 4px;
  border-radius: var(--radius-s);
}

.article-body pre {
  margin-top: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  overflow-x: auto;
}

.article-body pre code {
  background: none;
  padding: 0;
}

/* Sources list: compact reference links */
.article-body ul.sources {
  font-size: 0.9375rem;
}

/* End-of-article CTA */
.article-cta {
  margin-top: var(--space-6);
}

@media (max-width: 480px) {
  .article-head {
    padding-block: var(--space-7) var(--space-5);
  }

  .article-body {
    padding-bottom: var(--space-7);
  }

  .article-body h2 {
    margin-top: var(--space-6);
  }
}